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ASTM A513 (1020): Over 2-3/4" OD with wall thickness heavier than 0.25"
Tensile: 70,000 PSI. Yield: 60,000 PSI. Elongation in 2": 20%. Rockwell Hardness: B80
3.00" OD x 0.25" wall thickness (or more) of 65,000 PSI yield tubing may also be used.
Depending on your geographic location, various dealers should be able to supply the mounting post
you specify. The following dealers can supply DOM tubing: (Other dealers in your area may be a
better choice.)
Industrial Tube & Steel, Corp.: www.industrialtube.com
On Line Metal Store: www.onlinemetals.com
Speedy Metals: www.speedymetals.com
Metals Depot: www.metalsdepot.com
Note: DX Engineering does not recommend or endorse any specific
vendor.
This mounting pipe must be permanently mounted in the
ground, preferably in a concrete base 2 feet by 2 feet by 4
feet deep (with gravel below for drainage). The antenna
system requires this type of mounting to help withstand
the lateral forces present on the antenna during wind
conditions and when operating the pivot function. Make
the hole deep enough to accommodate at least 4 feet of
pipe and 4 to 6 inches of gravel at the bottom for
drainage. Set the mounting pipe on the gravel, use the
concrete to fill around the pipe per the concrete
instructions. Fill the hole until the concrete is level with
the ground around it. Use a level on the mounting pipe as
you fill the hole to be sure the mounting pipe is vertically
straight.
Your location, landscape and ground conditions may require different mounting solutions in order
to have the steel mounting pipe and the vertical antenna in a secure position.
Coaxial Cable to Mounting Pipe
The coaxial cable should be routed to the base of the antenna system and be buried below the radial
system. PVC Conduit pipe may be used to house the coaxial cable. Bury the cable 6" to 12" below
ground level.
Radial System
The use of a radial system is a key requirement for a high performance quarter wave vertical
antenna system. With a vertical antenna system, the radials are the second half of the antenna. The
radials contribute to the radiation efficiency of the entire vertical antenna system.
